Third National Health and Nutrition Examination Survey
(NHANES III), 1988-94
NHANES III TOTAL NUTRIENT INTAKES FILE DOCUMENTATION
Series 11, No. 2A
April 1998
Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Guidelines for Data Users. . . . . . . . . . . . . . . . . . . . . . . .
Survey Description . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sample Design and Analysis Guidelines. . . . . . . . . . . . . . . . . .
Data Preparation and Processing Procedures . . . . . . . . . . . . . . .
General References . . . . . . . . . . . . . . . . . . . . . . . . . . .
NHANES III Total Nutrient Intakes
General Information . . . . . . . . . . . . . . . . . . . . . . . .
Data File Index . . . . . . . . . . . . . . . . . . . . . . . . . .
Data File Item Descriptions, Codes, Counts, and Notes . . . . . . .
Introduction
The National Center for Health Statistics (NCHS) of the Centers for
Disease
Control and Prevention (CDC) collects, analyzes, and disseminates data on
the
health status of U.S. residents. The results of surveys, analyses, and
studies
are made known through a number of data release mechanisms including
publications, mainframe computer data files, CD-ROMs (Search and
Retrieval
Software, Statistical Export and Tabulation System (SETS)), and the
Internet.
The National Health and Nutrition Examination Survey (NHANES) is a
periodic
survey conducted by NCHS. The third National Health and Nutrition
Examination
Survey (NHANES III), conducted from 1988 through 1994, was the seventh in
a
series of these surveys based on a complex, multi-stage sample plan. It
was
designed to provide national estimates of the health and nutritional
status of
the United States' civilian, noninstitutionalized population aged two
months
and older.
The following table summarizes the NHANES III data which are currently
available on CD-ROM, including this release.
Table 1. Available NHANES III CD-ROMs
+----------------------+-------+---------+-----------------------------------+
|CD-ROM Name
|Release|Size in |Data Files / Description
|
|
|Date
|Megabytes|
|
+----------------------+-------+---------+-----------------------------------+
|NHANES III, 1988-94, |April |
407
|Dietary recall (replacement),
|
|Series 11, No. 2A,
|1998
|
|electrocardiography, laboratory
|
|ASCII Version (this
|
|
|(additional analytes), and
|
|release)
|
|
|vitamins/medicines data files
and
|
|
|
|
|documentation
|
+----------------------+-------+---------+-----------------------------------+
|NHANES III, 1988-94, |October|
285
|Adult and youth household
|
|Series 11, No. 1,
|1997
|
|questionnaire, examination, and
|
|Revised SETS Version |
|
|laboratory data files and
|
|1.22a
|
|
|documentation, plan and
operation, |
|
|
|
|analytic and reporting
guidelines, |
|
|
|
|weighting and estimation
|
|
|
|
|methodology, field operations,
|
|
|
|
|non-response bias
|
+----------------------+-------+---------+-----------------------------------+
|NHANES III, 1988-94, |July
|
454
|Adult and youth household
|
|Series 11, No. 1A,
|1997
|
|questionnaire, dietary recall,
|
|ASCII Version
|
|
|examination, and laboratory
data
|
|
|
|
|files and documentation
|
+----------------------+-------+---------+-----------------------------------+
|NHANES III, 1988-94, |July
|
285
|Adult and youth household
|
|Series 11, No. 1,
|1997
|
|questionnaire, examination, and
|
|SETS Version 1.22a * |
|
|laboratory data files and
|
|
|
|
|documentation
|
+----------------------+-------+---------+-----------------------------------+
|NHANES III Reference |October|
152
|Plan and operation, analytic
and
|
|Manuals and Reports
|1996
|
|reporting guidelines, weighting
and |
|October 1996
|
|
|estimation methodology, field
|
|
|
|
|operations, non-response bias
|
+----------------------+-------+---------+-----------------------------------+
*
Do not use this CD-ROM It had technical problems and has been
superseded by the revised SETS version 1.22a, Series 11, No. 1,
released in October 1997.
This release, Series 11, No. 2A, contains previously unreleased data and
corrections. Corrections were made to the vitamin/minerals portion of
the
adult and youth questionnaire data files as well as the dietary recall
portion
of the examination data file. For the laboratory component, some
previously
release variables have been augmented with NHANES III Phase 2 data. In
addition several new laboratory variables have been added.
The following table shows which public use files contain information from
the
interview and examination components.
Table 2. Location of the interview and examination components in the
NHANES III public use data files
Data File
Topic
| HA | HY | EXAM | LAB | DIET | VMS |
ECG |
------------------------------+-----+-----+-------+-----+------+-----+----+
Sample weights
| X | X |
X
| X |
. | . | X
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Age/race/sex
| X | X |
X
| X |
. | . | X
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Ethnic background
| X | X |
.
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Household composition
| X | X |
.
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Individual characteristics
| X | X |
.
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Health insurance
| X | X |
.
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Family background
| X | X |
.
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Occupation of family head
| X | X |
.
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Housing characteristics
| X | X |
.
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Family characteristics
| X | X |
.
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Orientation
| X | X |
.
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Health services
| X | X |
.
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Selected health conditions
| X | X |
X
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Diabetes questions
| X | . |
.
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
High blood pressure and
| X | . |
.
| . |
. | . | .
|
cholesterol questions
|
|
|
|
|
|
|
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Cardiovascular disease
| X | . |
.
| . |
. | . | .
|
questions
|
|
|
|
|
|
|
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Musculoskeletal conditions
| X | . |
.
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Physical functioning
| X | . |
.
| . |
. | . | .
|
questions
|
|
|
|
|
|
|
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Gallbladder disease
| X | . |
.
| . |
. | . | .
|
questions
|
|
|
|
|
|
|
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Table 2. (continued) Location of the interview and examination
components in
the NHANES III public use data files
Data File
Topic
| HA | HY | EXAM | LAB | DIET | VMS |
ECG |
------------------------------+-----+-----+-------+-----+------+-----+----+
Kidney conditions
| X | . |
.
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Respiratory and allergy
| X | X |
.
| . |
. | . | .
|
questions
|
|
|
|
|
|
|
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Diet questions
| X | . |
.
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Food frequency
| X | . |
X
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Vision questions
| X | X |
.
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Hearing questions
| X | X |
.
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Dental care and status
| X | X |
.
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Tobacco
| X | . |
X
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Occupation
| X | . |
.
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Language usage
| X | X |
.
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Exercise
| X | . |
.
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Social support/residence
| X | . |
.
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Vitamin/mineral/medicine
| X | X |
X
| . |
. | . | .
|
usage
|
|
|
|
|
|
|
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Blood pressure measurement
| X | . |
X
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Birth
| . | X |
X
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Infant feeding
| . | X |
.
| . |
. | . | .
|
practices/diet
|
|
|
|
|
|
|
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Motor and social development | . | X |
.
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Functional impairment
| X | X |
.
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
School attendance
| . | X |
.
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Cognitive function
| . | X |
X
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Table 2. (continued) Location of the interview and examination
components in
the NHANES III public use data files
Data File
Topic
| HA | HY | EXAM | LAB | DIET | VMS |
ECG |
------------------------------+-----+-----+-------+-----+------+-----+----+
Alcohol and drug use
| . | . |
X
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Reproductive health
| . | . |
X
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Diagnostic interview
| . | . |
X
| . |
. | . | .
|
schedule
|
|
|
|
|
|
|
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Activity
| . | . |
X
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Physician's examination
| . | . |
X
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Height and weight
| . | . |
X
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Body measurements
| . | . |
X
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Dental examination
| . | . |
X
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Allergy skin test
| . | . |
X
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Audiometry
| . | . |
X
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Tympanometry
| . | . |
X
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
WISC and WRAT
| . | . |
X
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Spirometry
| . | . |
X
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Bone densitometry
| . | . |
X
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Gallbladder ultrasonography
| . | . |
X
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Central nervous system
| . | . |
X
| . |
. | . | .
|
function evaluation
|
|
|
|
|
|
|
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Fundus photography
| . | . |
X
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Physical function evaluation | . | . |
X
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Fasting questions
| . | . |
.
| X |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Table 2. (continued) Location of the interview and examination
components in
the NHANES III public use data files
Data File
Topic
| HA | HY | EXAM | LAB | DIET | VMS |
ECG |
------------------------------+-----+-----+-------+-----+------+-----+----+
Laboratory tests on blood
| . | . |
.
| X |
. | . | .
|
and urine
|
|
|
|
|
|
|
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Total nutrient intakes
| . | . |
X
| . |
. | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Individual foods
| . | . |
.
| . |
X | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Combination foods
| . | . |
.
| . |
X | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Ingredients
| . | . |
.
| . |
X | . | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Prescription Medicines
| X | X |
.
| . |
. | X | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Vitamins and Minerals
| X | X |
.
| . |
. | X | .
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Electrocardiography
| . | . |
.
| . |
. | . | X
|
------------------------------+-----+-----+-------+-----+------+-----+----+
Data File Definitions
HA
HY
EXAM
LAB
DIET
-
Household Adult Data File
Household Youth Data File
Examination Data File
Laboratory Data File and Second Laboratory Data File
Dietary Recall Data Files
VMS
ECG
-
Vitamin Mineral Supplement Data File
Electrocardiography Data File
This document includes the documentation for the NHANES III Total
Nutrient
Intakes File and also contains a general overview of the survey and the
use of
the data files. The general overview includes five sections. The first
section, entitled "Guidelines for Data Users," contains important
information
about the use of the data files. The second section, "Survey
Description," is
a brief overview of the survey plan and operation. The third section,
"Sample
Design and Analysis Guidelines," describes some technical aspects of the
sampling plan and discusses some analytic issues particularly related to
the
use of data from complex sample surveys. The "Data Preparation and
Processing
Procedures" section describes the editing conventions and the codes used
to
represent the data. The last and fifth section, "General References,"
includes a reference list for the survey overview sections of the
document.
Public Use Data Files for the third National Health and Nutrition
Examination Survey will also be available from the National Technical
Information Service (NTIS). A list of NCHS public use data tapes
available
for purchase from NTIS may be obtained from the Data Dissemination Branch
at
NCHS. Information regarding a bibliography (on disk) of journal articles
citing data from all the NHANES and the availability of NHANES III data
in
CD-ROM/SETS software format can be obtained from the Data Dissemination
Branch at:
Data Dissemination Branch
National Center for Health Statistics
Room 1018
6525 Belcrest Road
Hyattsville, Maryland 20782
Phone: (301)436-8500
URL:http://www.cdc.gov/nchswww
NTIS can be contacted at:
NTIS - Computer Products Office
5285 Port Royal Road
Springfield, Virginia 22161
(703) 487-4807
Copies of all NHANES III questionnaires and data collection forms are
included in the Plan and Operation of the Third National Health and
Nutrition Examination Survey, 1988-94 (NCHS, 1994; U.S. DHHS, 1996).
This
publication, along with detailed information on NHANES procedures,
interviewing, data collection, quality control techniques, survey design,
nonresponse, and sample weighting can be found on the NHANES III
Reference
Manuals and Reports CD-ROM (U.S. DHHS, 1996). Information on how to
order
this CD-ROM is also available from the Data Dissemination Branch at NCHS
at
the address and telephone number given above.
GUIDELINES FOR DATA USERS
Please refer to the following important information before analyzing
data.
NHANES III Background Documents
o
The Plan and Operation of the Third National Health and Nutrition
Examination Survey, 1988-94, (NCHS, 1994; U.S. DHHS, 1996) provides
an
overview of the survey and includes copies of the survey forms.
o
The sample design, nonresponse, and analytic guidelines documents on
the NHANES III Reference Manuals and Reports CD-ROM (U.S. DHHS,
1996)
discuss the reasons that sample weights and the complex survey
design
should be taken into account when conducting any analysis.
o
Instruction manuals, laboratory procedures, and other NHANES III
reference manuals on the NHANES III Reference Manuals and Reports
CD-ROM(U.S. DHHS, 1996) are also available for further information
on
the details of the survey.
Analytic Data Set Preparation
o
Most NHANES III survey design and demographic variables are found
only
on the Adult and Youth Household Data Files available on the first
release. In preparing a data set for analysis, other data files
must
be merged with either or both of these files to obtain many
important
analytic variables.
o
All of the NHANES III public use data files are linked with the
common
survey participant identification number (SEQN). Merging
information
from multiple NHANES III data files using this variable ensures that
the appropriate information for each survey participant is linked
correctly.
o
NHANES III public use data files do not have the same number of
records on each file. The Household Questionnaire Files (divided
into
two files, Adult and Youth) contain more records than the
Examination
Data File because not everyone who was interviewed completed the
examination. The Laboratory Data File contains data only for persons
aged one year and older.
The Individual Foods Data File based on
the
dietary recall has multiple records for each person rather than the
one
record per sample person contained in the other data files.
o
and
For each data file, SAS program code with standard variable names
labels is provided as separate text files on the CD-ROM that
contains
the data files. This SAS program code can be used to create a SAS
data set from the data file.
o
Modifications were made to items in the questionnaires, laboratory,
and examination components over the course of the survey; as a
result,
data may not be available for certain variables for the full six
years.
In addition, variables may differ by phase since some changes were
implemented between phases. Users are encouraged to read the Notes
sections of this document carefully for information about changes.
o
Extremely high and low values have been verified whenever possible,
and numerous consistency checks have been performed. Nonetheless,
users
should examine the range and frequency of values before analyzing
data.
o
Some data were not ready for release at the time of this publication
due to continued processing of the data or analysis of laboratory
specimens. A listing of those data are available in the general
information section of each data file.
o
Confidential and administrative data are not being released to the
public. Additionally, some variables have been recoded to help
protect the confidentiality of the survey participants. For
example,
all age-related variables were recoded to 90+ years for persons who
were
90 years of age and older.
o
Some variable names may differ from those used in the Phase 1 NHANES
III Provisional Data Release and some variables included in the
Phase 1
provisional release may not appear on these files.
o
Although the data files have been edited carefully, errors may be
detected. Please notify NCHS staff (301-436-8500) of any errors in
the data file or the documentation.
Analytic Considerations
o
NHANES III (1988-94) was designed so that the survey's first three
years, 1988-91, its last three years, 1991-94, and the entire six
years were national probability samples. Analysts are encouraged to
use
all six years of survey results.
o
Sample weights are available for analyzing NHANES III data. One of
the following three sample weights will be appropriate for nearly
all
analyses: interviewed sample final weight (WTPFQX6), examined
sample
final weight (WTPFEX6), and mobile examination center (MEC)- and
home-examined sample final weight (WTPFHX6). Choosing which of
these
sample weights to use in any analysis depends on the variables being
used. A good rule of thumb is to use "the least common denominator"
approach. In this approach, the user checks the variables of
interest. The variable that was collected on the smallest number of
persons is the "least common denominator," and the sample weight
that
applies to that variable is the appropriate one to use for that
analysis. For more detailed information, see the Analytic and
Reporting
Guidelines for NHANES III (U.S. DHHS, 1996).
Referencing or Citing NHANES III Data
o
In publications, please acknowledge NCHS as the original data
source.
For instance, the reference for the NHANES III Laboratory Data File
On this CD-ROM is:
U.S. Department of Health and Human Services (DHHS). National
Center
for Health Statistics. Third National Health and Nutrition
Examination Survey, 1988-1994, NHANES III Second Laboratory Data
File
(CD-ROM, Series 11, No. 2A). Hyattsville, MD.: Centers for Disease
Control and Prevention, 1998.
o
Please place the acronym "NHANES III" in the titles or abstracts of
journal articles and other publications in order to facilitate the
retrieval of such materials in bibliographic searches.
SURVEY DESCRIPTION
The third National Health and Nutrition Examination Survey (NHANES III)
was
the seventh in a series of large health examination surveys conducted in
the United States beginning in 1960. Three of these surveys, the
National
Health Examination Surveys (NHES), were conducted in the 1960's (NCHS,
1965;
NCHS, 1967; NCHS, 1969). In 1970, an expanded nutrition component was
added
to provide data with which to assess nutritional status and dietary
practices, and the name was changed to the National Health and Nutrition
Examination Survey (Miller, 1973; Engel, 1978; McDowell, 1981). A
special
survey of Hispanic populations in the United States was conducted during
1982-1984 (NCHS, 1985).
The general structure of the NHANES III sample design was similar to that
of the previous NHANES. All of the surveys used complex, multi-stage,
stratified, clustered samples of civilian, noninstitutionalized
populations. NHANES III was the first NHANES without an upper age limit;
in
fact, the age range for the survey was two months and older. A home
examination option was employed for the first time in order to obtain
examination data for very young children and for elderly persons who were
unable to visit the mobile examination center (MEC). The home
examination
included only a subset of the components used in the full MEC examination
since it would have been difficult to collect some types of data in a
home
setting. A detailed description of design specifications and copies of
the
data collection forms can be found in the Plan and Operation of the Third
National Health and Nutrition Examination Survey, 1988-1994 (NCHS, 1994;
U.S.
DHHS, 1996).
NHANES III was conducted from October 1988 through October 1994 in two
phases, each of which comprised a national probability sample. The first
phase was conducted from October 18, 1988, through October 24, 1991, at
44
locations. The second phase was conducted from September 20, 1991,
through
October 15, 1994, at 45 different locations. In NHANES III, 39,695
persons
were selected over the six years; of those, 33,994 (86%) were interviewed
in their homes. All interviewed persons were invited to the MEC for a
medical examination. Seventy-eight percent (30,818) of the selected
persons
were examined in the MEC, and an additional 493 persons were given a
special,
limited examination in their homes.
Data collection began with a household interview. Several questionnaires
were administered in the household: Household Screener Questionnaire,
Family Questionnaire, Household Adult Questionnaire, and Household Youth
Questionnaire.
At the MEC, an examination was performed, and five automated
questionnaires
or interviews were administered: MEC Adult Questionnaire, MEC Youth
Questionnaire, MEC Proxy Questionnaire, 24-Hour Dietary Recall, and
Dietary
Food Frequency (ages 12-16 years). The health examination component
included a variety of tests and procedures. The examinee's age at the
time
of the interview and other factors determined which procedures were
administered. Blood and urine specimens were obtained, and a number of
tests
and measurements were performed including body measurements, spirometry,
fundus photography, x-rays, electrocardiography, allergy and glucose
tolerance tests, and ultrasonography. Measurements were taken of bone
density, hearing, and physical, cognitive, and central nervous system
functions. A physician performed a limited standardized medical
examination
and a dentist performed a standardized dental examination. While some of
the
blood and urine analyses were performed in the MEC laboratory, most
analyses
were conducted elsewhere by contract laboratories.
A home examination was conducted for those sample persons aged 2-11
months
and aged 20 years or older who were unable to visit the mobile
examination
center. The home examination consisted of an abbreviated version of the
tests and interviews performed in the MEC. Depending on age of the
sample
person, the components included body measurements, blood pressure,
spirometry, venipuncture, physical function evaluation, and a
questionnaire
to inquire about infant feeding, selected health conditions, cognitive
function, tobacco use, and reproductive history.
SAMPLE DESIGN AND ANALYSIS GUIDELINES
Sample Design
The general structure of the NHANES III sample design is the same as that
of the previous NHANES. Each of these surveys used a stratified, multistage
probability design. The major design parameters of the two previous
NHANES
and the special Hispanic HANES, as well as NHANES III, have been
previously
summarized (Miller, 1973; McDowell, 1981; NCHS, 1985; NCHS, 1994). The
NHANES III sample was designed to be self-weighting within a primary
sampling unit (PSU) for subdomains (age, sex, and race-ethnic groups).
While
the sample was fairly close to self-weighting nationally for each of
these
subdomain groups, it was not representative of the total population,
which
includes institutionalized, non-civilian persons that were outside the
scope of the survey.
The NHANES III sample represented the total civilian,
noninstitutionalized
population, two months of age or over, in the 50 states and the District
of
Columbia of the United States. The first stage of the design consisted
of
selecting a sample of 81 PSU's that were mostly individual counties. In
a
few cases, adjacent counties were combined to keep PSU's above a minimum
population size. The PSU's were stratified and selected with probability
proportional to size (PPS). Thirteen large counties (strata) were chosen
with certainty (probability of one). For operational reasons, these 13
certainty PSU's were divided into 21 survey locations. After the 13
certainty strata were designated, the remaining PSU's in the United
States
were grouped into 34 strata, and two PSU's were selected per stratum (68
survey locations). The selection was done with PPS and without
replacement. The NHANES III sample therefore consists of 81 PSU's or 89
locations.
The 89 locations were randomly divided into two groups, one for each
phase.
The first group consisted of 44 and the other of 45 locations. One set
of PSU's was allocated to the first three-year survey period (1988-91)
and
the other set to the second three-year period (1991-94). Therefore,
unbiased estimates (from the point of view of sample selection) of health
and
nutrition characteristics can be independently produced for both Phase 1
and Phase 2 as well as for both phases combined.
For most of the sample, the second stage of the design consisted of area
segments composed of city or suburban blocks, combinations of blocks, or
other area segments in places where block statistics were not produced in
the 1980 Census. In the first phase of NHANES III, the area segments
were
used only for a sample of persons who lived in housing units built before
1980. For units built in 1980 and later, the second stage consisted of
sets
of addresses selected from building permits issued in 1980 or later.
These
are referred to as "new construction segments." In the second phase,
1990
Census data and maps were used to define the area segments. Because the
second phase followed within a few years of the 1990 Census, new
construction
did not account for a significant part of the sample, and the entire
sample
came from the area segments.
The third stage of sample selection consisted of households and certain
types of group quarters, such as dormitories. All households and
eligible
group quarters in the sample segments were listed, and a subsample was
designated for screening to identify potential sample persons. The
subsampling rates enabled production of a national, approximately
equal-probability sample of households in most of the United States with
higher rates for the geographic strata with high Mexican-American
populations. Within each geographic stratum, there was a nearly
equal-probability sample of households across all 89 stands.
Persons within the sample of households or group quarters were the fourth
stage of sample selection. All eligible members within a household were
listed, and a subsample of individuals was selected based on sex, age,
and
race or ethnicity. The definitions of the sex, age, race or ethnic
classes, subsampling rates, and designation of potential sample persons
within screened households were developed to provide approximately
self-weighting samples for each subdomain within geographic strata and at
the
same time to maximize the average number of sample persons per sample
household. Previous NHANES indicated that this increased the overall
participation rate. Although the exact sample sizes were not known until
data collection was completed, estimates were made. Below is a summary
of
the sample sizes for the full six-year NHANES III at each stage of
selection:
Number
Number
Number
Number
Number
Number
Number
Number
Number
of
of
of
of
of
of
of
of
of
PSU's
stands (survey locations)
segments
households screened
households with sample persons
designated sample persons
interviewed sample persons
MEC-examined sample persons
home-examined sample persons
81
89
2,144
93,653
19,528
39,695
33,994
30,818
493
More detailed information on the sample design and weighting and
estimation
procedures for NHANES III can be found in the Plan and Operation of the
Third National Health and Nutrition Examination Survey, 1988-94 (NCHS,
1994;
U.S. DHHS, 1996) and in the Analytic and Reporting Guidelines: Third
National
Health and Nutrition Examination Survey (NHANES III), 1988-94 (U.S. DHHS,
1996).
Analysis Guidelines
Because of the complex survey design used in NHANES III, traditional
methods of statistical analysis based on the assumption of a simple
random
sample are not applicable. Detailed descriptions of this issue and
possible
analytic methods for analyzing NHANES data have been described earlier
(NCHS,
1985; Yetley, 1987; Landis, 1982; Delgado, 1990). Recent analytic and
reporting guidelines that should be used for most NHANES III analyses and
publications are contained in Analytic and Reporting Guidelines (U.S.
DHHS,
1996). These recommendations differ slightly from those used by analysts
for
previous NHANES surveys. These suggested guidelines provide a framework
to
users for producing estimates that conform to the analytic design of the
survey. All users are strongly urged to review these analytic and
reporting
guidelines before beginning any analyses of NHANES III data.
It is important to remember that this set of statistical guidelines is
not
absolute. When conducting analyses, the analyst needs to use his/her
subject matter knowledge (including methodological issues) as well as
information about the survey design. The more one deviates from the
original
analytic categories defined in the sample design, the more important it
is to
evaluate the results carefully and to interpret the findings cautiously.
In NHANES III, 89 survey locations were randomly divided into two sets or
phases, the first consisting of 44 and the other of 45 locations. One
set
of PSU's was allocated to the first three-year survey period (1988-91)
and
the other set to the second three-year period (1991-94). Therefore,
unbiased
national estimates of health and nutrition characteristics can be
independently produced for each phase as well as for both phases
combined.
Computation of national estimates from both phases combined (i.e., total
NHANES III) is the preferred option; individual phase estimates may be
highly variable. In addition, individual phase estimates are not
statistically independent. It is also difficult to evaluate whether
differences in individual phase estimates are real or due to
methodological
differences. That is, differences may be due to changes in sampling
methods
or data collection methodology over time. At this time, there is no
valid
statistical test for examining differences between Phase 1 and Phase 2.
Therefore, although point estimates can be produced separately for each
phase, no test is available to test whether those estimates are
significantly different from each other.
NHANES III is based on a complex, multi-stage probability sample design.
Several aspects of the NHANES design must be taken into account in data
analysis, including the sample weights and the complex survey design.
Appropriate sample weights are needed to estimate prevalence, means,
medians, and other statistics. Sample weights are used to produce
correct
population estimates because each sample person does not have the same
probability of selection. The sample weights incorporate the
differential
probabilities of selection and include adjustments for noncoverage and
nonresponse. A detailed discussion of nonresponse adjustments and issues
related to survey coverage have been published (U.S. DHHS, 1996). With
the
large oversampling of young children, older persons, black persons, and
Mexican-Americans in NHANES III, it is essential that the sample weights
be
used in all analyses. Otherwise, a misinterpretation of results is
highly
likely. Other aspects of the design that must be taken into account in
data
analyses are the strata and PSU pairings from the sample design. These
pairings should be used to estimate variances and test for statistical
significance. For weighted analyses, analysts can use special computer
software packages that use an appropriate method for estimating variances
for
complex samples such as SUDAAN (Shah, 1995) and WesVarPC (Westat, 1996).
Although initial exploratory analyses may be performed on unweighted data
using standard statistical packages and assuming simple random sampling,
final analyses should be done on weighted data using appropriate sample
weights. A summary of the weighting methodology and the type of sample
weights developed for NHANES III is included in Weighting and Estimation
Methodology (U.S. DHHS, 1996).
The purpose of weighting the sample data is to permit analysts to produce
estimates of statistics that would have been obtained if the entire
sampling frame (the United States) had been surveyed. Sample weights can
be
considered as measures of the number of persons the particular sample
observation represents. Weighting takes into account several features of
the survey: the specific probabilities of selection for the individual
domains that were oversampled as well as nonresponse and differences
between
the sample and the total U.S. population. Differences between the sample
and
the population may arise due to sampling variability, differential
undercoverage in the survey among demographic groups, and possibly other
types of response errors, such as differential response rates or
misclassification errors. Sample weighting in NHANES III was used to:
1.
Compensate for differential probabilities of selection among
subgroups
(i.e., age-sex-race-ethnicity subdomains where persons living in
different geographic strata were sampled at different rates);
2.
Reduce biases arising from the fact that nonrespondents may be
different from those who participate;
3.
Bring sample data up to the dimensions of the target population
totals;
4.
Compensate, to the extent possible, for inadequacies in the sampling
frame (resulting from omissions of some housing units in the listing
of area segments, omissions of persons with no fixed address, etc.);
and
5.
To reduce variances in the estimation procedure by using auxiliary
information that is known with a high degree of accuracy.
In NHANES III, the sample weighting was carried out in three stages. The
first stage involved the computation of weights to compensate for unequal
probabilities of selection (objective 1, above). The second stage
adjusted
for nonresponse (objective 2). The third stage used poststratification
of
the sample weights to Census Bureau estimates of the U.S. population to
accomplish the third, fourth, and fifth objectives simultaneously. In
NHANES III, several types of sample weights (see the sample weights table
that follows) were computed for the interviewed and examined sample and
are
included in the NHANES III data file. Also, sample weights were computed
separately for Phase 1 (1988-91), Phase 2 (1991-94), and total NHANES III
(1988-94) to facilitate analysis of items collected only in Phase 1, only
in Phase 2, and over six years of the survey. Three sets of pseudo
strata
and PSU pairings are provided to use with SUDAAN in variance estimation.
Since NHANES III is based on a complex, multi-stage sample design,
appropriate sample weights should be used in analyses to produce national
estimates of prevalence and associated variances while accounting for
unequal probability of selection of sample persons. For example, the
final
interview weight, WTPFQX6, should be used for analysis of the items or
questions from the family or household questionnaires, and the final MEC
examination weight, WTPFEX6, should be used for analysis of the
questionnaires and measurements administered in the MEC. Furthermore,
for a
combined analysis of measurements from the MEC examinations and
associated
medical history questions from the household interview, the final MEC
examination weight, WTPFEX6, should be used. We recommend using SUDAAN
(Shah, 1995) to estimate statistics of interest and the associated
variance.
However, one can also use other published methods for variance
estimation.
Application of SUDAAN and alternative methods, such as the average design
effect approach, balance repeated replication (BRR) methods, or jackknife
methods for variance estimation, are discussed in Weighting and
Estimation
Methodology (U.S. DHHS, 1996).
Appropriate Uses of the NHANES III Sample Weights
Final interview weight, WTPFQX6
Use only in conjunction with the sample interviewed at home and
with items collected during the household interview.
Final examination (MEC only) weight, WTPFEX6
Use only in conjunction with the MEC-examined sample and with
interview and examination items collected at the MEC.
Final MEC+home examination weight, WTPFHX6
Use only in conjunction with the MEC+home-examined sample and
with items collected at both the MEC and home.
Final allergy weight, WTPFALG6
Use only in conjunction with the allergy subsample and with
items
collected as part of the allergy component of the exam.
Final CNS weight, WTPFCNS6
Use only in conjunction with the CNS subsample and with items
collected as part of the CNS component of the exam.
Final morning examination (MEC only) subsample weight, WTPFSD6
Use only in conjunction with the MEC-examined persons assigned
to
the morning subsample and only with items collected in the MEC
exam.
Final afternoon/evening examination (MEC only) subsample weight, WTPFMD6
Use only in conjunction with the MEC-examined persons assigned
to
the afternoon/evening subsample and only with items collected
in
the MEC exam.
Final morning examination (MEC+home) subsample weight, WTPFHSD6
Use only in conjunction with the MEC- and home-examined persons
assigned to the morning subsample and with items collected
during
the MEC and home examinations.
Final afternoon/evening examination (MEC+home) weight, WTPFHMD6
Use only in conjunction with the MEC- and home-examined persons
assigned to the afternoon/evening subsample and with items
collected during the MEC and home examinations.
DATA PREPARATION AND PROCESSING PROCEDURES
Automated data collection procedures for the survey were introduced in
NHANES III. In the mobile examination centers, data for the interview
and
examination components were recorded directly onto a computerized data
collection form. With the exception of a few independently automated
systems, the system was centrally integrated. This operation allowed for
ongoing monitoring of much of the data. Before the introduction of the
computer-assisted personal interview (CAPI), the household questionnaire
data were reviewed manually by field editors and interviewers. CAPI
(1992-1994 only) questionnaires featured built-in edits to prevent
entering
inconsistencies and out-of-range responses. The multi-level data
collection and quality control systems are discussed in detail in the
Plan
and Operation of the Third National Health and Nutrition Examination
Survey,
1988-1994 (NCHS, 1994; U.S. DHHS, 1996). All interview, laboratory, and
examination data were sent to NCHS for final processing.
Guidelines were developed that provided standards for naming variables,
filling missing values and coding conventional responses, handling
missing
records, and standardizing two-part quantity/unit questionnaire
variables.
NCHS staff, assisted by contract staff, developed data editing
specifications that checked data sets for valid codes, ranges, and skip
pattern consistencies and examined the consistency of values between
interrelated variables. Comments, collected in both interviews and
examination components, were reviewed and recoded when possible.
Responses
to "Other" and "Specify" were recoded either to existing code categories
or
to new categories. The documentation for each data set includes notes
for
those variables that have been recoded and standardized and for those
variables that differ significantly from what appears in the original
data
collection instrument. While the data have undergone many quality
control
and editing procedures, there still may be values that appear extreme or
illogical. Values that varied considerably from what was expected were
examined by analysts who checked for comments or other responses that
might
help to clarify unusual values. Generally, values were retained unless
they
could not possibly be true, in which case they were changed to "Blank but
applicable." Therefore, the user must review each data set for extreme
or
inconsistent values and determine the status of each value for analysis.
Several editing conventions were used in the creation of final analytic
data sets:
1.
Standardized variables were created to replace all two-part
quantity/unit questions using standard conversion factors.
Standardized variables have the same name as the variable of the
two-part question with an "S" suffix. For instance, MAPF18S (Months
received WIC benefits) in the MEC Adult Questionnaire was created
from
the two-part response option to question F18, "How long did you
receive
benefits from the WIC program?," using the conversion factor 12
months
per year.
2.
Recoded variables were created by combining responses from two or
more
like variables, or by collapsing responses to create a summary
variable for the purpose of confidentiality. Recoded variables have
the
original variable name with an R suffix. For example, place of
birth
variable (HFA6X) in the Family Questionnaire was collapsed to a
three
level response category (U.S., Mexico, Other) and renamed HFA6XR.
Generally, only the recoded variable has been included in the data
file.
3.
Fill values, a series of one or more digits, were used to represent
certain specific conditions or responses. Below is a list of the
fill
values that were employed. Some of the fill values pertain only to
questionnaire data, although 8-fill and blank-fill values are found
in
all data sets.
Other fill values, not included in this list, are
used
to represent component-specific conditions.
6-fills = Varies/varied. (Questionnaires only)
7-fills = Fewer than the smallest number that could be reported
within
the question structure (e.g., fewer than one cigarette per day).
(Questionnaires only)
8-fills = Blank but applicable/cannot be determined.
This means
that
a respondent was eligible to receive the question, test, or
component
but did not because of refusal, lack of time, lack of staff, loss of
data, broken vial, language barrier, unreliability, or other similar
reasons.
9-fills = Don't know. This fill was used only when a respondent did
not know the response to a question and said, "I don't know."
(Questionnaires only)
Blank fills = Inapplicable. If a respondent was not eligible for a
questionnaire, test, or component because of age, gender, or
specific
reason, the variable was blank-filled. In the questionnaire, if a
respondent was not asked a question because of a skip-pattern,
variables corresponding to the question were blank-filled. For
examination or laboratory components, if a person was excluded by a
defined protocol (e.g., screening exclusion questions) and these
criteria are included in the data set, then the corresponding
variables were blank-filled for that person. For home examinees,
variables for examination components and blood tests not performed
as
part of the home examination protocol were blank-filled.
4.
to
For variables describing discrete data, codes of zero (0) were used
mean "none," "never," or the equivalent. Value labels for which "0"
is used include: "has not had," "never regularly," "still taking,"
or
"never stopped using." Unless otherwise labeled, for variables
containing continuous data, "zero" means "zero.
5.
Where there are logical skip patterns in the flow of the
questionnaire
or examination component, the skip was indicated by placing the
variable label of the skip destination in parentheses as part of the
value label of the response generating the skip. For example, in
the
Physical Function Evaluation, the variable PFPWC (in wheelchair) has
a
value label, "2 No (PFPSCOOT)" that means that the next item for
persons not in a wheelchair would be represented by the variable,
PFPSCOOT.
Variable Nomenclature
A unique name was assigned to every NHANES III variable using a standard
convention. By following this naming convention, the origin of each
variable is clear, and there is no chance of overlaying similar variables
across multiple components. Variables range in length from three to
eight
characters. The first two variable characters represent the topic (e.g.,
analyte, questionnaire instrument, examination component) and are listed
below alphabetically by topic. For questionnaires administered in the
household, the remainder of the variable name following the first two
characters indicates the question section and number. For example, data
for the response to the Household Adult Questionnaire question B1 are
contained in the variable HAB1. For most laboratory and examination
variables, as well as some other variables, a "P" in the third position
refers to "primary" and the remainder of the variable name is a brief
description of the item. For instance, in the Laboratory Data File,
information on the length of time the person fasted before the first
blood
draw is contained in the variable PHPFAST. The variable PHPFAST was
derived
as follows: characters 1-2 (PH) refer to "phlebotomy," character 3 (P)
refers to "primary," characters 4-8 (FAST) refer to an abbreviation for
"fasting."
CODE
TOPIC
AT
AM
AP
AL
AC
AN
TM
TA
AA
AB
AS
LA
AU
BA
BO
BS
BC
BX
BL
BU
BM
BD
C1
C2
CR
UD
Alanine aminotransferase (from biochemistry profile)
Albumin (from biochemistry profile)
Alkaline phosphatase (from biochemistry profile)
Allergy skin test
Alpha carotene
Anisocytosis
Antimicrosomal antibodies
Antithyroglobulin antibodies
Apolipoprotein (AI)
Apolipoprotein (B)
Aspartate aminotransferase (from biochemistry profile)
Atypical lymphocyte
Audiometry
Band
Basophil
Basophilic stippling
Beta carotene
Beta cryptoxanthin
Blast
Blood urea nitrogen (BUN) (from biochemistry profile)
Body measurements
Bone densitometry
C-peptide (first venipuncture)
C-peptide (second venipuncture)
C-reactive protein
Cadmium
CN
CL
CO
CE
UR
Central nervous system function evaluation
Chloride (from biochemistry profile)
Cotinine
Creatinine (serum)(from biochemistry profile)
Creatinine (urine)
CODE
TOPIC
DM
DE
MQ
DR
EO
EP
FR
FB
RB
FO
FH
FP
GG
profile)
GU
GB
G1
G2
SG
GH
GR
C3
HD
HP
HT
HG
AH
HB
SS
SA
HC
DH
H1
H2
HX
HO
HF
HA
HQ
HS
HY
HZ
I1
I2
UI
FE
SF
LD
L1
LC
PB
Demographic
Dental examination
Diagnostic interview schedule
Dietary recall (total nutrient intakes)
Eosinophil
Erythrocyte protoporphyrin
Ferritin
Fibrinogen
Folate (RBC)
Folate (serum)
Follicle stimulating hormone (FSH)
Fundus photography
Gamma glutamyl transferase (GGT) (from biochemistry
Gallbladder ultrasonography
Globulin (from biochemistry profile)
Glucose (first venipuncture)
Glucose (second venipuncture)
Glucose (from biochemistry profile)
Glycated hemoglobin
Granulocyte
HCO3 (Bicarbonate)(from biochemistry profile)
HDL cholesterol
Helicobacter pylori antibody
Hematocrit
Hemoglobin
Hepatitis A antibody (HAV)
Hepatitis B core antibody (anti-HBc)
Hepatitis B surface antibody (anti-HBs)
Hepatitis B surface antigen (HBsAg)
Hepatitis C antibody (HCV)
Hepatitis D antibody (HDV)
Herpes 1 antibody
Herpes 2 antibody
Home examination (general)
Homocysteine
Household family questionnaire
Household adult questionnaire
Household questionnaire variables (composite)
Household screener questionnaire
Household youth questionnaire
Hypochromia
Insulin (first venipuncture)
Insulin (second venipuncture)
Iodine (urine)
Iron
Iron (from biochemistry profile)
Lactate dehydrogenase (from biochemistry profile)
Latex antibody
LDL cholesterol (calculated)
Lead
LP
LH
Lipoprotein (a)
Luteinizing hormone
CODE
TOPIC
LU
LY
LM
MR
MC
MH
MV
PV
MA
MX
FF
MP
MY
ME
MI
MO
MN
ML
IC
OS
PH
PS
PF
PE
PL
DW
PK
PO
SK
PR
RC
RW
RE
RF
RU
WT
SE
SI
NA
SH
SP
SD
TT
TE
TH
T4
TB
CA
SC
TC
CH
TI
Lutein/zeaxanthin
Lycopene
Lymphocyte
Macrocyte
Mean cell hemoglobin (MCH)
Mean cell hemoglobin concentration (MCHC)
Mean cell volume (MCV)
Mean platelet volume
MEC adult questionnaire
MEC examination (general)
Dietary food frequency (ages 12-16 years)
MEC proxy questionnaire
MEC youth questionnaire
Metamyelocyte
Microcyte
Monocyte
Mononuclear cell
Myelocyte
Normalized calcium (derived from ionized calcium)
Osmolality (from biochemistry profile)
Phlebotomy data collected in MEC (e.g., questions)
Phosphorus (from biochemistry profile)
Physical function evaluation
Physician's examination
Platelet
Platelet distribution width
Poikilocytosis
Polychromatophilia
Potassium (from biochemistry profile)
Promyelocyte
Red blood cell count (RBC)
Red cell distribution width (RDW)
Retinyl esters
Rheumatoid factor antibody
Rubella antibody
Sample weights
Selenium
Sickle cell
Sodium (from biochemistry profile)
Spherocyte
Spirometry
Survey design
Target cell
Tetanus
Thyroid Stimulating Hormone (TSH)
Thyroxine
Total bilirubin (from biochemistry profile)
Total calcium
Total calcium (from biochemistry profile)
Total cholesterol
Total cholesterol (from biochemistry profile)
Total iron binding capacity (TIBC)
TP
TX
Total protein (from biochemistry profile)
Toxic granulation
CODE
TOPIC
TO
PX
TG
TR
TY
UA
UB
VU
VR
VA
VB
VC
VD
VE
WC
WW
Toxoplasmosis antibody
Transferrin saturation
Triglycerides
Triglycerides (from biochemistry profile)
Tympanometry
Uric acid (from biochemistry profile)
Urinary albumin
Vacuolated cells
Varicella antibody
Vitamin A
Vitamin B12
Vitamin C
Vitamin D
Vitamin E
White blood cell count (WBC)
WISC/WRAT cognitive test
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80(suppl.):6-10. 1990.
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I
Augmentation Survey of Adults 25-74 Years, United States, 1974-75.
National Center for Health Statistics. Vital Health Stat 1(14). 1978.
Freeman DH, Freeman JL, Brock DB, Koch GG. Strategies in the
multivariate
analysis of data from complex surveys II: an application to the United
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1976.
Khare M, Mohadjer LK, Ezzati-Rice TM, Waksberg J. An evaluation of
nonresponse bias in NHANES III (1988-91). 1994 Proceedings of the Survey
Research Methods section of the American Statistical Association. 1994.
Landis JR, Lepkowski JM, Eklund SA, Stehouwer SA. A statistical
methodology for analyzing data from a complex survey, the first National
Health and Nutrition Examination Survey. National Center for Health
Statistics. Vital Health Stat 2(92). 1982.
McDowell A, Engel A, Massey JT, Maurer K. Plan and operation of the
second
National Health and Nutrition Examination Survey, 1976-80. National
Center
for Health Statistics. Vital Health Stat 1(15). 1981.
Miller HW. Plan and operation of the Health and Nutrition Examination
Survey, United States, 1971-1973. National Center for Health Statistics.
Vital Health Stat 1(10a) and (10b). 1973.
National Center for Health Statistics. Plan and initial program of the
Health Examination Survey. Vital Health Stat 1(4). 1965.
National Center for Health Statistics. Plan and operation of a health
examination survey of U.S. youths 12-17 years of age. Vital Health Stat
1(8). 1969.
National Center for Health Statistics. Plan and operation of the
Hispanic
Health and Nutrition Examination Survey, 1982-84. Vital Health Stat
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1985.
National Center for Health Statistics. Plan and operation of the Third
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Stat 1(32). 1994.
National Center for Health Statistics. Plan, operation, and response
results of a program of children's examinations. Vital Health Stat 1(5).
1967.
Shah BV, Barnwell BG, Bieler GS. SUDAAN User's Manual: Software for
Analysis of Correlated Data. Research Triangle Park, NC: Research
Triangle
Institute. Release 6.04. 1995.
Skinner CJ. Aggregated analysis: standard errors and significance
tests.
In: Skinner CJ, Holt D, Smith TMF, eds. Analysis of complex surveys.
New
York: John Wiley and Sons, Inc. 1989.
U.S. Department of Health and Human Services (DHHS). National Center for
Health Statistics. NHANES III reference manuals and reports (CD-ROM).
Hyattsville, MD: Centers for Disease Control and Prevention, 1996.
Available from National Technical Information Service (NTIS),
Springfield,
VA. Acrobat .PDF format; includes access software: Adobe Systems, Inc.
Acrobat Reader 2.1.
Westat, Inc.
1996.
A User's Guide to WesVarPC.
Rockville, MD.
Westat, Inc.
Yetley E, Johnson C. Nutritional applications of the Health and
Nutrition
Examination Surveys (HANES). Annu Rev Nutr 7:441-63. 1987.
TOTAL NUTRIENT INTAKES
Introduction
This release of the NHANES III Total Nutrient File differs from the
Series 11,
Nos. 1 and 1A release (July, 1997) in two respects. First, the food gram
weight values for a small number of individual food records were
corrected.
The corrected gram weight values affect total nutrient and individual
food
record energy and nutrient values for a small number of respondents and
are
unlikely to alter group data that were based on the series 11, Nos 1 and
1A
release. NCHS prepared Series 11, No. 2A versions of the NHANES III
Foods Data
Files.
Second, this release reports total nutrient intake data that are based on
the
University of Minnesota Nutrition Coordinating Center (NCC) nutrient
database
data (NCC, 1996 and Buzzard, 1987). The NCC database has information on
more
than eighty nutrients and food components, including individual fatty
acids,
artificial sweeteners, amino acids, sugars, caffeine, selenium, and
vitamin D.
The NCC nutrient variables are denoted by the prefix 'NCP'.
NHANES III Dietary Interview Methodology
Dietary interviews were administered to all examinees by a trained
dietary
interviewer in the mobile examination center (MEC). The nutrient intakes
reported in this file include nutrients from foods and beverages reported
in
the 24-hour dietary recall. The nutrient intakes do not include
nutrients
obtained from other sources (i.e., nutritional supplements, antacids,
medications, salt and seasonings added to prepared foods at the table,
and
plain unbottled drinking water). Questionnaire data on food sufficiency,
intake of plain drinking water and salt use are included in this file as
well.
Analysts are encouraged to use six years of survey data in their
analyses. The
reliability of estimates is improved when larger sample sizes are used.
For
more detailed information, see the Analytic and Reporting Guidelines for
NHANES
III (U.S. DHHS, 1996b). In addition, MEC final examination weights
(WTPFEX6)
should be used when analyzing the total nutrient intake data and related
questionnaire data in this file. For more information on the use of
sample
weights in NHANES III data analysis, refer to the NHANES III Analytic and
Reporting Guidelines (U.S. DHHS, 1996b).
Respondents reported all foods and beverages consumed except plain
drinking
water (i.e., not bottled) for the previous 24-hour time period (midnight
to
midnight). An automated, microcomputer-based dietary interview and
coding
system known as the NHANES III Dietary Data Collection (DDC) System was
used to
collect all NHANES III dietary recall data. The DDC system was developed
for
use in the survey by the University of Minnesota's Nutrition Coordinating
Center (NCC). Total nutrient intakes are reported in this file for
respondents
whose dietary recalls were coded complete and reliable (DRPSTAT=1).
The dietary interviews were conducted in English and Spanish by bilingual
dietary interviewers in a private room to ensure confidentiality. Proxy
respondents were permitted for infants and children aged two months
through
five years and for other respondents who were unable to report on their
own.
Children aged six to 11 years were permitted to report their own intake
if the
interviewer deemed it acceptable and appropriate, but many interviewers
for
respondents in this age category were completed by proxy or with the
child and
a proxy. The dietary interviewers contacted other information sources
such as
care providers and schools to obtain complete dietary intake data for
respondents.
The primary source of food composition data for NHANES III is the U.S.
Department of Agriculture (USDA) Survey Nutrient Database; two nutrient
files
were provided by USDA for use in NHANES III (USDA 1993, 1995). Each USDA
file
contained food composition values that were appropriate for the time
period
during which the NHANES III data were collected. Additionally, food
composition
data for a small number of herbs and spices were obtained from NCC (NCC,
1996).
The NHANES III dietary recall data files were also coded to the NCC foods
database. The files were produced using the NCC version of the NHANES
III code
generator processing program. The output from the program produces a
file
with food gram weights and NCC food codes. These coded food records were
merged with the NCC nutrient composition database (NCC, 1996). The
NHANES III
file variables that are based on NCC database information have an 'NCP'
prefix
identifier in the Total Nutrients file.
The DDC system foods database was designed specifically to handle timerelated
changes in food descriptions, food amounts, and recipes; updated
information
was applied retrospectively to data collected in the early part of NHANES
III.
As was mentioned earlier, two USDA food nutrient composition databases
were
used to assign nutrient values to the USDA database versions of the
NHANES III
dietary recalls (USDA 1993; USDA, 1995). The NCC foods database that was
used
to code the NHANES III data had a multi-version design (NCC, 1996); when
appropriate, some database updates were made retroactively to data
reported
during earlier years of the survey. The goals of database maintenance
for the
USDA and NCC databases were the same: to incorporate changes that
occurred in
the nutrient values of foods due to food product reformulations and
recipe
changes, and foods analysis; to incorporate new information about food
amounts;
and to update the databases with new food products that were added to the
market while the survey was in operation. The U.S. marketplace underwent
tremendous growth and change as new food product lines were introduced
and new
food components were added to the food supply (e.g., fat substitutes and
artificial sweeteners). The impact of these and other changes in the
food
supply may require additional analysis for appropriate data
interpretation.
Dietary recall interviews were edited by the interviewers to ensure that
they
were as complete as possible. NCHS completed all final editing and
determinations regarding the completeness and reliability of the dietary
recalls. Analysts should note that the data reported are self-reported
data.
Extreme values were verified.
Information on dietary supplements and antacids was reported separately
during
the Household Adult and Household Youth Questionnaires. Nutrient intakes
from
dietary supplement products are not included in the total nutrient intake
data
reported in this file. Release 2A of the Adult and Youth Household
Questionnaire Data Files provides detailed information about dietary
supplements.
A number of quality-control monitoring techniques were employed during
the
survey. For example, the techniques for monitoring the Dietary Interview
component included observations of actual dietary interviews and reviews
of
audiotaped interviews by NCHS and contractor staff. In addition, the
dietary
interviewers worked in two-person teams; there was one team in each MEC.
The
dietary interviewers performed 10-percent cross-check reviews of their
partners' work using printed recall reports. Finally, newsletters, field
memoranda, telephone calls, and staff retraining sessions were other
methods
used to maintain quality control during the survey. Refer to the NHANES
III
Dietary Interviewer's Training Manual for the dietary interview protocol
(U.S.
DHHS, 1996b).
NHANES III Data File Index
----------------------------------------------------------------------Variable
Description
Name
Positions
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
Respondent identification number ............
SEQN
1-5
GENERAL INFORMATION
Recall Status Code ..........................
DRPSTAT
Recall day ..................................
DRPRDAY
Respondent,24hr dietary recall interview ....
DRPRESP
Language, 24-hr dietary recall interview ....
DRPLANG
Interviewer ID ..............................
DRPIID
6
7-8
9
10
11-
12
QUESTIONS
Compare food consumed yesterday to usual ....
DRPQ1
How much plain water drink in 24 hrs -oz ....
DRPQ2A
Type of salt you usually add at table .......
DRPQ3
How often do you add salt at the table ......
DRPQ4
#days had no food/money for food,past mo ....
DRPQ5
Because not enough money or other reason ....
DRPQ6
Skip meals because no food/money,past mo ....
DRPQ7
# days skip meals, no food/money,past mo ....
DRPQ8
Skip any meals yesterday, no food/money .....
DRPQ9
Any days not eat, no food/money, past mo ....
DRPQ10
# days didn't eat at all in past month ......
DRPQ11
Are you person who preps meals at home ......
DRPQ12
13
14-
16
17
18
19-
20
21
22
23-
24
25
26
28
29
27-
USDA DATABASE NUTRIENT QUANTITIES
Total grams of foods and beve. consumed .....
DRPGW
30-
Water (gm) ..................................
DRPNWATE
35-
Calories (kcal) .............................
DRPNKCAL
40-
Protein (gm) ................................
DRPNPROT
45-
Total fats (gm) .............................
DRPNTFAT
51-
Total saturated fatty acids (gm) ............
DRPNSFAT
57-
Total monounsaturated fatty acids (gm) ......
DRPNMFAT
62-
Total polyunsaturated fatty acids (gm) ......
DRPNPFAT
67-
34
39
44
50
56
61
66
71
NHANES III Data File Index
----------------------------------------------------------------------Variable
Description
Name
Positions
----------------------------------------------------------------------Cholesterol (mg) ............................
DRPNCHOL
72-
Total carbohydrates (gm) ....................
DRPNCARB
76-
Dietary fiber (gm) ..........................
DRPNFIBE
82-
Alcohol (gm) ................................
DRPNALCO
87-
Total vitamin A (IU) ........................
DRPNVAIU
91-
Total vitamin A (RE) ........................
DRPNVARE
97-
Total carotenes (RE) ........................
DRPNCARO
102-
Total alpha-tocopherol equivalents (mg) .....
DRPNVE
107-
Vitamin C (mg) ..............................
DRPNVC
113-
Thiamin (mg) ................................
DRPNVB1
117-
Riboflavin (mg) .............................
DRPNVB2
122-
Niacin (mg) .................................
DRPNNIAC
127-
Vitamin B6 (mg) .............................
DRPNVB6
132-
Folic acid (mcg) ............................
DRPNFOLA
137-
Vitamin B12 (mcg) ...........................
DRPNVB12
142-
Calcium (mg) ................................
DRPNCALC
148-
Phosphorous (mg) ............................
DRPNPHOS
153-
Magnesium (mg) ..............................
DRPNMAGN
158-
Iron (mg) ...................................
DRPNIRON
162-
Zinc (mg) ...................................
DRPNZINC
167-
Copper (mg) .................................
DRPNCOPP
173-
Sodium (mg) .................................
DRPNSODI
177-
75
81
86
90
96
101
106
112
116
121
126
131
136
141
147
152
157
161
166
172
176
181
Potassium (mg) ..............................
DRPNPOTA
182-
Pct kcal from total fat (%kcal) .............
DRPNKF
187-
Pct kcal from saturated fat (%kcal) .........
DRPNKSF
192-
Pct kcal from monosaturated fat (%kcal) .....
DRPNKMF
196-
Pct kcal from polysaturated fat (%kcal) .....
DRPNKPF
200-
Pct kcal from protein (%kcal) ...............
DRPNKP
204-
Pct kcal from carbohydrate (%kcal) ..........
DRPNKC
209-
Pct kcal from alcohol (%kcal) ...............
DRPNKA
214-
Total grams of foods and beve. consumed .....
NCPGW
219-
Water (gm) ..................................
NCPNWATE
224-
Calories (kcal) .............................
NCPNKCAL
229-
Protein (gm) ................................
NCPNPROT
234-
Total fats (gm) .............................
NCPNTFAT
240-
Total saturated fatty acids (gm) ............
NCPNSFAT
246-
186
191
195
199
203
208
213
218
NCC DATABASE NUTRIENT QUANTITIES
223
228
233
239
245
250
NHANES III Data File Index
----------------------------------------------------------------------Variable
Description
Name
Positions
----------------------------------------------------------------------Total monounsaturated fatty acids (gm) ......
NCPNMFAT
251-
Total polyunsaturated fatty acids (gm) ......
NCPNPFAT
256-
Cholesterol (mg) ............................
NCPNCHOL
261-
Total carbohydrates (gm) ....................
NCPNCARB
265-
Dietary fiber (gm) ..........................
NCPNFIBE
271-
Alcohol (gm) ................................
NCPNALCO
276-
Total vitamin A (IU) ........................
NCPNVAIU
280-
Retinol (mcg) ...............................
NCPNRETI
286-
Beta-carotene (mcg) .........................
NCPNBCAR
291-
Total alpha-tocopherol equivalents (mg) .....
NCPNVE
297-
Vitamin C (mg) ..............................
NCPNVC
302-
Thiamin (mg) ................................
NCPNVB1
306-
Riboflavin (mg) .............................
NCPNVB2
311-
Niacin (mg) .................................
NCPNNIAC
316-
Vitamin B6 (mg) .............................
NCPNVB6
321-
Folic acid (mcg) ............................
NCPNFOLA
326-
Vitamin B12 (mcg) ...........................
NCPNVB12
331-
Calcium (mg) ................................
NCPNCALC
337-
Phosphorous (mg) ............................
NCPNPHOS
342-
Magnesium (mg) ..............................
NCPNMAGN
347-
Iron (mg) ...................................
NCPNIRON
351-
Zinc (mg) ...................................
NCPNZINC
356-
255
260
264
270
275
279
285
290
296
301
305
310
315
320
325
330
336
341
346
350
355
361
Copper (mg) .................................
NCPNCOPP
362-
Sodium (mg) .................................
NCPNSODI
366-
Potassium (mg) ..............................
NCPNPOTA
371-
Crude Fiber (gm) ............................
NCPNCFIB
376-
Ash (gm) ....................................
NCPNASH
380-
Caffeine (mg) ...............................
NCPNCAFE
385-
Selenium (mcg) ..............................
NCPNSELE
389-
Pantothenic acid (mg) .......................
NCPNPACI
395-
Alpha-tocopherol (mg) .......................
NCPNATOC
400-
Beta-tocopherol (mg) ........................
NCPNBTOC
405-
Gamma-tocopherol (mg) .......................
NCPNGTOC
409-
Delta-tocopherol (mg) .......................
NCPNDTOC
414-
Vitamin D (mcg) .............................
NCPNVD
419-
SFA
4:0 (gm) ...............................
NCPNS040
424-
SFA
6:0 (gm) ...............................
NCPNS060
428-
SFA
8:0 (gm) ...............................
NCPNS080
431-
SFA 10:0 (gm) ...............................
NCPNS100
435-
SFA 12:0 (gm) ...............................
NCPNS120
439-
365
370
375
379
384
388
394
399
404
408
413
418
423
427
430
434
438
443
NHANES III Data File Index
----------------------------------------------------------------------Variable
Description
Name
Positions
----------------------------------------------------------------------SFA 14:0 (gm) ...............................
NCPNS140
444-
SFA 16:0 (gm) ...............................
NCPNS160
448-
SFA 17:0 (gm) ...............................
NCPNS170
453-
SFA 18:0 (gm) ...............................
NCPNS180
456-
SFA 20:0 (gm) ...............................
NCPNS200
461-
SFA 22:0 (gm) ...............................
NCPNS220
464-
MFA 14:1 (gm) ...............................
NCPNM141
467-
MFA 16:1 (gm) ...............................
NCPNM161
470-
Oleic acid (MFA 18:1) (gm) ..................
NCPNM181
474-
MFA 20:1 (gm) ...............................
NCPNM201
479-
MFA 22:1 (gm) ...............................
NCPNM221
483-
Linoleic acid (PFA 18:2) (gm) ...............
NCPNP182
487-
Linolenic acid (PFA 18:3) (gm) ..............
NCPNP183
492-
PFA 18:4 (gm) ...............................
NCPNP184
496-
PFA 20:4 (gm) ...............................
NCPNP204
499-
PFA 20:5 (gm) ...............................
NCPNP205
502-
PFA 22:5 (gm) ...............................
NCPNP225
505-
PFA 22:6 (gm) ...............................
NCPNP226
508-
Glucose (gm) ................................
NCPNGLUC
512-
Fructose (gm) ...............................
NCPNFRUC
517-
Galactose (gm) ..............................
NCPNGALA
522-
Sucrose (gm) ................................
NCPNSUCR
526-
447
452
455
460
463
466
469
473
478
482
486
491
495
498
501
504
507
511
516
521
525
531
Lactose (gm) ................................
NCPNLACT
532-
Maltose (gm) ................................
NCPNMALT
537-
Water insoluble dietary fiber (gm) ..........
NCPNIFIB
542-
Water soluble dietary fiber (gm) ............
NCPNSFIB
547-
Pectin (gm) .................................
NCPNPECT
551-
Starch (gm) .................................
NCPNSTAR
555-
Aspartame (mg) ..............................
NCPNASPR
561-
Tryptophan (gm) .............................
NCPNTRYP
568-
Threonine (gm) ..............................
NCPNTHRE
572-
Isoleucine (gm) .............................
NCPNISOL
576-
Leucine (gm) ................................
NCPNLEUC
580-
Lysine(gm) ..................................
NCPNLYSI
584-
Methionine (gm) .............................
NCPNMETH
588-
Cystine (gm) ................................
NCPNCYST
592-
Phenylalanine (gm) ..........................
NCPNPHAL
596-
Tyrosine (gm) ...............................
NCPNTYRO
600-
Valine (gm) .................................
NCPNVALI
604-
Arginine (gm) ...............................
NCPNARGI
608-
536
541
546
550
554
560
567
571
575
579
583
587
591
595
599
603
607
611
NHANES III Data File Index
----------------------------------------------------------------------Variable
Description
Name
Positions
----------------------------------------------------------------------Histidine (gm) ..............................
NCPNHIST
612-
Alanine (gm) ................................
NCPNALAN
616-
Aspartic Acid (gm) ..........................
NCPNASPA
620-
Glutamic Acid (gm) ..........................
NCPNGLUT
625-
Glycine (gm) ................................
NCPNGLYC
630-
Proline (gm) ................................
NCPNPROL
634-
Serine (gm) .................................
NCPNSERI
638-
Saccharin (mg) ..............................
NCPNSACC
642-
Animal Protein (gm) .........................
NCPNAPRO
648-
Vegetable Protein (gm) ......................
NCPNVPRO
653-
Oxalic Acid (mg) ............................
NCPNOXAA
658-
Phytic Acid (mg) ............................
NCPNPHYA
665-
Pct kcal from total fat (%kcal) .............
NCPNKF
672-
Pct kcal from saturated fat (%kcal) .........
NCPNKSF
677-
Pct kcal from monosaturated fat (%kcal) .....
NCPNKMF
681-
Pct kcal from polysaturated fat (%kcal) .....
NCPNKPF
685-
Pct kcal from protein (%kcal) ...............
NCPNKP
689-
Pct kcal from carbohydrate (%kcal) ..........
NCPNKC
694-
Pct kcal from alcohol (%kcal) ...............
NCPNKA
699-
615
619
624
629
633
637
641
647
652
657
664
671
676
680
684
688
693
698
703
NHANES III Data File
----------------------------------------------------------------------FILENAME=EXAMDR
VERSION 1.1
N=30818
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------1-5
SEQN
30818
Respondent identification number
00003-53623
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------GENERAL INFORMATION
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------6
Recall status code
See
note
DRPSTAT
29105
586
184
326
1
2
3
4
300
317
5
8
7-8
Reliable and complete
Reliable, but incomplete
Unreliable
Interview lost due to computer
malfunction or file transfer
problem
Breastfeeding infant or child
Blank but applicable
Recall day
See
note
DRPRDAY
2707
2729
3126
5734
5365
7627
2893
637
9
01
02
03
04
05
06
07
88
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Blank but applicable
Respondent for the 24-hour dietary
note
DRPRESP
20727
8467
987
637
recall interview
1
Examinee, i.e. self-reported
2
Proxy
3
Examinee and proxy
8
Blank but applicable
See
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------GENERAL INFORMATION
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------10
Language of 24-hour dietary recall
note
DRPLANG
11-12
DRPIID
25936
3864
230
151
637
interview
1
English
2
Spanish
3
English and Spanish
4
Other language
8
Blank but applicable
7195
596
7619
8076
333
169
2513
3844
94
2
19
358
Interviewer number
01
02
03
04
05
06
07
08
10
11
12
88
Blank but applicable
See
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------QUESTIONS
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------13
How does the amount of food consumed
See
note
DRPQ1
663
25383
2893
1513
366
14-16
yesterday compare with (your/his/her)
usual consumption for that day of the
week? Was it...
1
Much more than usual
2
Usual
3
Much less than usual
8
Blank but applicable
9
Don't know
How much plain drinking water do you
See
note
DRPQ2A
2362
26861
796
799
17
usually drink in a 24-hour period?
Include only plain tap or spring water.
(fl oz)
000
None
001-576
888
Blank but applicable
999
Don't know
What type of salt do you usually add to
note
DRPQ3
15382
12985
872
298
800
481
your food at the table?
0
None (DRPQ5)
2
Ordinary salt
3
Lite salt
4
Salt substitute
8
Blank but applicable
9
Don't know
See
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------QUESTIONS
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------18
DRPQ4
5354
5127
3982
811
162
15382
19-20
How often do you add salt at the table?
1
Rarely
2
Occasionally
3
Very often
8
Blank but applicable
9
Don't know
Blank
Thinking about the past month, how many
See
note
DRPQ5
28097
1664
1
7
825
224
21
days did you have no food or money to
buy food?
00
None (DRPQ7)
01-31 Number of days
55
Refusal (DRPQ12)
66
Greater than zero number of days,
not further specified
88
Blank but applicable
99
Don't know (DRPQ7)
Is that because there wasn't enough
note
DRPQ6
1341
314
832
9
28322
money
1
2
8
9
Blank
to buy food or another reason?
Not enough money
Another reason (DRPQ12)
Blank but applicable
Don't know
See
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------QUESTIONS
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------22
During the past month, did (you/___)
See
note
DRPQ7
1097
28489
831
86
315
23-24
skip any meals because there wasn't
enough food or money to buy food?
1
Yes
2
No (DRPQ12)
8
Blank but applicable
9
Don't know (DRPQ9)
Blank
How many days in the past month did
See
note
DRPQ8
1063
4
832
29
28890
25
(you/___) skip any meals because there
wasn't enough food or money to buy food?
01-30
66
Greater than zero number of days,
not further specified
88
Blank but applicable
99
Don't know
Blank
Did (you/___) skip any meals yesterday
note
DRPQ9
207
943
832
32
28804
because there wasn't enough food or
money to buy food?
1
Yes
2
No
8
Blank but applicable
9
Don't know
Blank
See
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------QUESTIONS
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------26
During the past month, were there any
See
note
DRPQ10
202
945
832
35
28804
27-28
days when (you/__) did not eat at all
because there wasn't enough food or
money to buy food?
1
Yes
2
No (DRPQ12)
8
Blank but applicable
9
Don't know (DRPQ12)
Blank
In the past month, how many days were
note
DRPQ11
53
49
38
19
23
4
5
3
3
1
1
832
3
29784
there when (you/___) didn't eat at all?
01
02
03
04
05
06
07
08
10
12
66
Greater than zero number of days,
not further specified
88
Blank but applicable
99
Don't know
Blank
See
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------QUESTIONS
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------29
DRPQ12
17249
10586
1878
262
835
8
Are you the person who usually prepares
the meals at home?
1
Yes
2
No
3
Shared preparation
4
Food not prepared at home
8
Blank but applicable
9
Don't know
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------USDA DATABASE NUTRIENT QUANTITIES
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------30-34
USDA database total grams of foods and
See
note
DRPGW
29105
1713
35-39
beverages consumed
00000-14802
88888 Blank but applicable
USDA database water (gm)
note
DRPNWATE
40-44
DRPNKCAL
45-50
DRPNPROT
51-56
DRPNTFAT
29105
1713
00000-14130
88888 Blank but applicable
29105
1713
USDA database food energy (kcal)
00000-17739
88888 Blank but applicable
29105
1713
USDA database protein (gm)
000000-000707
888888 Blank but applicable
29105
1713
USDA database total fat (gm)
000000-0856.2
888888 Blank but applicable
29105
1713
USDA database total saturated
fatty acids (gm)
00000-282.4
88888 Blank but applicable
29105
1713
USDA database total monounsaturated
fatty acids (gm)
00000-341.1
88888 Blank but applicable
57-61
DRPNSFAT
62-66
DRPNMFAT
See
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------USDA DATABASE NUTRIENT QUANTITIES
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------67-71
DRPNPFAT
72-75
DRPNCHOL
76-81
DRPNCARB
82-86
DRPNFIBE
87-90
DRPNALCO
91-96
DRPNVAIU
97-101
DRPNVARE
102-106
DRPNCARO
29105
1713
USDA database total polyunsaturated
fatty acids (gm)
00000-202.4
88888 Blank but applicable
29105
1713
USDA database cholesterol (mg)
0000-3752
8888 Blank but applicable
29105
1713
USDA database carbohydrate (gm)
000000-2087.2
888888 Blank but applicable
29105
1713
USDA database total dietary fiber (gm)
00000-00134
88888 Blank but applicable
29105
1713
USDA database alcohol (gm)
0000-0717
8888 Blank but applicable
29105
1713
USDA database vitamin A (IU)
000000-243618
888888 Blank but applicable
29105
1713
USDA database vitamin A (RE)
00000-45237
88888 Blank but applicable
29105
1713
USDA database carotenes (RE)
00000-24342
88888 Blank but applicable
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------USDA DATABASE NUTRIENT QUANTITIES
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------107-112
DRPNVE
113-116
DRPNVC
117-121
DRPNVB1
122-126
DRPNVB2
127-131
DRPNNIAC
132-136
DRPNVB6
137-141
DRPNFOLA
142-147
DRPNVB12
29105
1713
USDA database vitamin E (alpha
tocopherol equivalents)
000000-0601.1
888888 Blank but applicable
29105
1713
USDA database ascorbic acid (mg)
0000-1516
8888 Blank but applicable
29105
1713
USDA database thiamin (mg)
00000-24.74
88888 Blank but applicable
29105
1713
USDA database riboflavin (mg)
00000-029.1
88888 Blank but applicable
29105
1713
USDA database niacin (mg)
00000-320.4
88888 Blank but applicable
29105
1713
USDA database vitamin B6 (mg)
00000-32.19
88888 Blank but applicable
29105
1713
USDA database folacin (micrograms)
00000-06426
88888 Blank but applicable
29105
1713
USDA database vitamin B12 (micrograms)
000000-261.52
888888 Blank but applicable
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------USDA DATABASE NUTRIENT QUANTITIES
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------148-152
DRPNCALC
153-157
DRPNPHOS
158-161
DRPNMAGN
162-166
DRPNIRON
167-172
DRPNZINC
173-176
DRPNCOPP
177-181
DRPNSODI
182-186
DRPNPOTA
29105
1713
USDA database calcium (mg)
00000-10002
88888 Blank but applicable
29105
1713
USDA database phosphorus (mg)
00000-10041
88888 Blank but applicable
29105
1713
USDA database magnesium (mg)
0000-1920
8888 Blank but applicable
29105
1713
USDA database iron (mg)
00000-286.5
88888 Blank but applicable
29105
1713
USDA database zinc (mg)
000000-0748.3
888888 Blank but applicable
29105
1713
USDA database copper (mg)
0000-37.5
8888 Blank but applicable
29105
1713
USDA database sodium (mg)
00000-33967
88888 Blank but applicable
29105
1713
USDA database potassium (mg)
00000-20572
88888 Blank but applicable
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------USDA DATABASE NUTRIENT QUANTITIES
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------187-191
USDA database percent of kilocalories
See
note
DRPNKF
29103
1715
192-195
from total fat
00000-083.9
88888 Blank but applicable
USDA database percent of kilocalories
See
note
DRPNKSF
29103
1715
196-199
from saturated fat
0000-51.5
8888 Blank but applicable
USDA database percent of kilocalories
See
note
DRPNKMF
29103
1715
200-203
from monounsaturated fat
0000-37.7
8888 Blank but applicable
USDA database percent of kilocalories
See
note
DRPNKPF
29103
1715
204-208
from polyunsaturated fat
0000-0040
8888 Blank but applicable
USDA database percent of kilocalories
See
note
DRPNKP
29103
1715
209-213
from protein
00000-102.2
88888 Blank but applicable
USDA database percent of kilocalories
note
DRPNKC
29103
1715
from carbohydrate
00000-00120
88888 Blank but applicable
See
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------USDA DATABASE NUTRIENT QUANTITIES
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------214-218
USDA database percent of kilocalories
note
DRPNKA
29103
1715
from alcohol
00000-082.7
88888 Blank but applicable
See
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------NCC DATABASE NUTRIENT QUANTITIES
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------219-223
NCPGW
224-228
NCPNWATE
229-233
NCPNKCAL
234-239
NCPNPROT
240-245
NCPNTFAT
29105
1713
NCC database total grams of foods and
beverages consumed
00000-14802
88888 Blank but applicable
29105
1713
NCC database water (gm)
00000-14130
88888 Blank but applicable
29105
1713
NCC database food energy (kcal)
00000-17644
88888 Blank but applicable
29105
1713
NCC database protein (gm)
000000-0673.6
888888 Blank but applicable
29105
1713
NCC database total fat (gm)
000000-0880.6
888888 Blank but applicable
29105
1713
NCC database total saturated fatty
acids (gm)
00000-397.6
88888 Blank but applicable
29105
1713
NCC database total monounsaturated fatty
acids (gm)
00000-361.8
88888 Blank but applicable
246-250
NCPNSFAT
251-255
NCPNMFAT
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------NCC DATABASE NUTRIENT QUANTITIES
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------256-260
NCPNPFAT
261-264
NCPNCHOL
265-270
NCPNCARB
271-275
NCPNFIBE
276-279
NCPNALCO
280-285
NCPNVAIU
286-290
NCPNRETI
291-296
NCPNBCAR
29105
1713
NCC database total polyunsaturated fatty
acids (gm)
00000-175.8
88888 Blank but applicable
29105
1713
NCC database cholesterol (mg)
0000-3636
8888 Blank but applicable
29105
1713
NCC database carbohydrate (gm)
000000-2042.8
888888 Blank but applicable
29105
1713
NCC database total dietary fiber (gm)
00000-136.4
88888 Blank but applicable
29105
1713
NCC database alcohol (gm)
0000-0669
8888 Blank but applicable
29105
1713
NCC database vitamin A (IU)
000000-243634
888888 Blank but applicable
29105
1713
NCC database retinol (mcg)
00000-36772
88888 Blank but applicable
29105
1713
NCC database beta-carotene (mcg)
000000-145806
888888 Blank but applicable
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------NCC DATABASE NUTRIENT QUANTITIES
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------297-301
NCPNVE
302-305
NCPNVC
306-310
NCPNVB1
311-315
NCPNVB2
316-320
NCPNNIAC
321-325
NCPNVB6
326-330
NCPNFOLA
331-336
NCPNVB12
29105
1713
NCC database vitamin E (alpha tocopherol
equivalents)
00000-323.8
88888 Blank but applicable
29105
1713
NCC database ascorbic acid (mg)
0000-1725
8888 Blank but applicable
29105
1713
NCC database thiamin (mg)
00000-24.64
88888 Blank but applicable
29105
1713
NCC database riboflavin (mg)
00000-28.89
88888 Blank but applicable
29105
1713
NCC database niacin (mg)
00000-317.5
88888 Blank but applicable
29105
1713
NCC database vitamin B6 (mg)
00000-31.93
88888 Blank but applicable
29105
1713
NCC database folacin (micrograms)
00000-06367
88888 Blank but applicable
29105
1713
NCC database vitamin B12 (micrograms)
000000-303.67
888888 Blank but applicable
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------NCC DATABASE NUTRIENT QUANTITIES
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------337-341
NCPNCALC
342-346
NCPNPHOS
347-350
NCPNMAGN
351-355
NCPNIRON
356-361
NCPNZINC
362-365
NCPNCOPP
366-370
NCPNSODI
371-375
NCPNPOTA
29105
1713
NCC database calcium (mg)
00000-09870
88888 Blank but applicable
29105
1713
NCC database phosphorus (mg)
00000-09671
88888 Blank but applicable
29105
1713
NCC database magnesium (mg)
0000-1765
8888 Blank but applicable
29105
1713
NCC database iron (mg)
00000-290.5
88888 Blank but applicable
29105
1713
NCC database zinc (mg)
000000-0747.3
888888 Blank but applicable
29105
1713
NCC database copper (mg)
0000-37.1
8888 Blank but applicable
29105
1713
NCC database sodium (mg)
00000-33012
88888 Blank but applicable
29105
1713
NCC database potassium (mg)
00000-20416
88888 Blank but applicable
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------NCC DATABASE NUTRIENT QUANTITIES
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------376-379
NCPNCFIB
380-384
NCPNASH
385-388
NCPNCAFE
389-394
NCPNSELE
395-399
NCPNPACI
400-404
NCPNATOC
405-408
NCPNBTOC
409-413
NCPNGTOC
29105
1713
NCC database crude Fiber (gm)
0000-46.2
8888 Blank but applicable
29105
1713
NCC database ash (gm)
00000-140.4
88888 Blank but applicable
29105
1713
NCC database caffeine (mg)
0000-5048
8888 Blank but applicable
29105
1713
NCC database selenium (mcg)
000000-1259.7
888888 Blank but applicable
29105
1713
NCC database pantothenic acid (mg)
00000-157.5
88888 Blank but applicable
29105
1713
NCC database alpha-tocopherol (mg)
00000-318.6
88888 Blank but applicable
29105
1713
NCC database beta-tocopherol (mg)
0000-13.9
8888 Blank but applicable
29105
1713
NCC database gamma-tocopherol (mg)
00000-219.1
88888 Blank but applicable
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------NCC DATABASE NUTRIENT QUANTITIES
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------414-418
NCPNDTOC
419-423
NCPNVD
29105
1713
NCC database delta-tocopherol (mg)
00000-064.4
88888 Blank but applicable
29105
1713
NCC database vitamin D (mcg)
00000-102.5
88888 Blank but applicable
424-427
NCC database sFA 4:0 (gm)
See
note
NCPNS040
29105
1713
428-430
0000-07.8
8888 Blank but applicable
NCC database sFA 6:0 (gm)
See
note
NCPNS060
29105
1713
431-434
000-4.7
888
Blank but applicable
NCC database sFA 8:0 (gm)
See
note
NCPNS080
29105
1713
435-438
0000-14.4
8888 Blank but applicable
NCC database sFA 10:0 (gm)
See
note
NCPNS100
29105
1713
439-443
0000-12.4
8888 Blank but applicable
NCC database sFA 12:0 (gm)
See
note
NCPNS120
29105
1713
444-447
00000-065.4
88888 Blank but applicable
NCC database sFA 14:0 (gm)
note
NCPNS140
29105
1713
0000-41.3
8888 Blank but applicable
See
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------NCC DATABASE NUTRIENT QUANTITIES
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------448-452
NCC database sFA 16:0 (gm)
See
note
NCPNS160
29105
1713
453-455
00000-161.8
88888 Blank but applicable
NCC database sFA 17:0 (gm)
See
note
NCPNS170
29105
1713
456-460
000-0.5
888
Blank but applicable
NCC database sFA 18:0 (gm)
See
note
NCPNS180
29105
1713
461-463
00000-121.2
88888 Blank but applicable
NCC database sFA 20:0 (gm)
See
note
NCPNS200
29105
1713
464-466
000-2.3
888
Blank but applicable
NCC database sFA 22:0 (gm)
See
note
NCPNS220
29105
1713
467-469
000-4.4
888
Blank but applicable
NCC database mFA 14:1 (gm)
See
note
NCPNM141
29105
1713
470-473
000-2.3
888
Blank but applicable
NCC database mFA 16:1 (gm)
See
note
NCPNM161
29105
1713
474-478
0000-35.8
8888 Blank but applicable
NCC database oleic acid (MFA 18:1) (gm)
note
NCPNM181
29105
00000-341.6
See
1713
88888 Blank but applicable
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------NCC DATABASE NUTRIENT QUANTITIES
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------479-482
NCC database mFA 20:1 (gm)
See
note
NCPNM201
29105
1713
483-486
0000-07.7
8888 Blank but applicable
NCC database mFA 22:1 (gm)
See
note
NCPNM221
29105
1713
487-491
0000-05.5
8888 Blank but applicable
NCC database linoleic acid
See
note
NCPNP182
29105
1713
492-495
(PFA 18:2) (gm)
00000-167.9
88888 Blank but applicable
NCC database linolenic acid
See
note
NCPNP183
29105
1713
496-498
(PFA 18:3) (gm)
0000-17.1
8888 Blank but applicable
NCC database pFA 18:4 (gm)
See
note
NCPNP184
29105
1713
499-501
000-001
888
Blank but applicable
NCC database pFA 20:4 (gm)
See
note
NCPNP204
29105
1713
502-504
000-4.2
888
Blank but applicable
NCC database pFA 20:5 (gm)
note
NCPNP205
29105
1713
000-4.1
888
Blank but applicable
See
505-507
NCC database pFA 22:5 (gm)
note
NCPNP225
29105
1713
000-1.7
888
Blank but applicable
See
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------NCC DATABASE NUTRIENT QUANTITIES
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------508-511
NCC database pFA 22:6 (gm)
note
NCPNP226
512-516
NCPNGLUC
517-521
NCPNFRUC
522-525
NCPNGALA
526-531
NCPNSUCR
532-536
NCPNLACT
537-541
NCPNMALT
29105
1713
0000-07.8
8888 Blank but applicable
29105
1713
NCC database glucose (gm)
00000-00353
88888 Blank but applicable
29103
1713
2
NCC database fructose (gm)
00000-372.1
88888 Blank but applicable
Blank
29105
1713
NCC database galactose (gm)
0000-11.1
8888 Blank but applicable
29105
1713
NCC database sucrose (gm)
000000-1349.7
888888 Blank but applicable
29105
1713
NCC database lactose (gm)
00000-307.1
88888 Blank but applicable
29105
1713
NCC database maltose (gm)
00000-109.5
88888 Blank but applicable
29105
1713
NCC database water insoluble
dietary fiber (gm)
00000-092.7
88888 Blank but applicable
542-546
NCPNIFIB
See
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------NCC DATABASE NUTRIENT QUANTITIES
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------547-550
NCPNSFIB
551-554
NCPNPECT
555-560
NCPNSTAR
561-567
NCPNASPR
568-571
NCPNTRYP
572-575
NCPNTHRE
576-579
NCPNISOL
580-583
NCPNLEUC
29105
1713
NCC database water soluble
dietary fiber (gm)
0000-52.7
8888 Blank but applicable
29104
1713
1
NCC database pectin (gm)
0000-21.6
8888 Blank but applicable
Blank
29105
1713
NCC database starch (gm)
000000-1034.6
888888 Blank but applicable
29105
1713
NCC database aspartame (mg)
0000000-0002190
8888888 Blank but applicable
29105
1713
NCC database tryptophan (gm)
0000-0008
8888 Blank but applicable
29105
1713
NCC database threonine (gm)
0000-0026
8888 Blank but applicable
29105
1713
NCC database isoleucine (gm)
0000-30.1
8888 Blank but applicable
29105
1713
NCC database leucine (gm)
0000-52.8
8888 Blank but applicable
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------NCC DATABASE NUTRIENT QUANTITIES
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------584-587
NCPNLYSI
588-591
NCPNMETH
592-595
NCPNCYST
596-599
NCPNPHAL
600-603
NCPNTYRO
604-607
NCPNVALI
608-611
NCPNARGI
612-615
NCPNHIST
29105
1713
NCC database lysine(gm)
0000-47.6
8888 Blank but applicable
29105
1713
NCC database methionine (gm)
0000-16.1
8888 Blank but applicable
29105
1713
NCC database cystine (gm)
0000-08.8
8888 Blank but applicable
29105
1713
NCC database phenylalanine (gm)
0000-29.5
8888 Blank but applicable
29105
1713
NCC database tyrosine (gm)
0000-0025
8888 Blank but applicable
29105
1713
NCC database valine (gm)
0000-0034
8888 Blank but applicable
29105
1713
NCC database arginine (gm)
0000-35.1
8888 Blank but applicable
29105
1713
NCC database histidine (gm)
0000-20.1
8888 Blank but applicable
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------NCC DATABASE NUTRIENT QUANTITIES
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------616-619
NCPNALAN
620-624
NCPNASPA
625-629
NCPNGLUT
630-633
NCPNGLYC
634-637
NCPNPROL
638-641
NCPNSERI
642-647
NCPNSACC
648-652
NCPNAPRO
29105
1713
NCC database alanine (gm)
0000-31.4
8888 Blank but applicable
29105
1713
NCC database aspartic Acid (gm)
00000-056.9
88888 Blank but applicable
29105
1713
NCC database glutamic Acid (gm)
00000-135.6
88888 Blank but applicable
29105
1713
NCC database glycine (gm)
0000-44.7
8888 Blank but applicable
29105
1713
NCC database proline (gm)
0000-46.7
8888 Blank but applicable
29105
1713
NCC database serine (gm)
0000-30.9
8888 Blank but applicable
29105
1713
NCC database saccharin (mg)
000000-0947.5
888888 Blank but applicable
29105
1713
NCC database animal Protein (gm)
00000-493.8
88888 Blank but applicable
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------NCC DATABASE NUTRIENT QUANTITIES
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------653-657
NCPNVPRO
658-664
NCPNOXAA
665-671
NCPNPHYA
29105
1713
NCC database vegetable Protein (mg)
00000-00180
88888 Blank but applicable
29105
1713
NCC database oxalic Acid (mg)
0000000-17630.8
8888888 Blank but applicable
29105
1713
NCC database phytic Acid (mg)
0000000-09138.8
8888888 Blank but applicable
672-676
NCC database percent of kilocalories
See
note
NCPNKF
29103
1715
677-680
from total fat
00000-083.9
88888 Blank but applicable
NCC database percent of kilocalories
See
note
NCPNKSF
29103
1715
681-684
from saturated fat
0000-47.1
8888 Blank but applicable
NCC database percent of kilocalories
See
note
NCPNKMF
29103
1715
685-688
from monounsaturated fat
0000-39.5
8888 Blank but applicable
NCC database percent of kilocalories
note
NCPNKPF
29103
1715
from polyunsaturated fat
0000-39.9
8888 Blank but applicable
See
NHANES III Data File
----------------------------------------------------------------------TOTAL NUTRIENT INTAKES
----------------------------------------------------------------------NCC DATABASE NUTRIENT QUANTITIES
----------------------------------------------------------------------Positions
Item description
SAS name
Counts
and code
Notes
----------------------------------------------------------------------689-693
NCC database percent of kilocalories
See
note
NCPNKP
29103
1715
694-698
from protein
00000-102.2
88888 Blank but applicable
NCC database percent of kilocalories
See
note
NCPNKC
29103
1715
699-703
from carbohydrate
00000-00104
88888 Blank but applicable
NCC database percent of kilocalories
note
NCPNKA
29103
1715
from alcohol
00000-081.9
88888 Blank but applicable
See
NOTES
DRPGW:
Total grams of foods and beverages consumed
This is the total gram weight of all foods and
excluding plain drinking water consumed during
period. Two examinees with DRPSTAT=1 consumed
beverages on the recall day and have values of
beverages,
a 24-hour time
no foods or
zero for all
food
and nutrient intake variables.
DRPLANG:
Language of interview
This is the language that was used primarily during the 24hour recall. The English/Spanish combination was selected if a
significant portion of the interview was conducted in each
language. The "Other language" selection refers to interviews
that were conducted in a language other than English or
Spanish;
interpreters were used to complete interviews in other
languages.
Note: There are six examinees who do not have 24-hour dietary
recall data but do have information pertaining to drinking
water,
salt use, and food sufficiency; DRPLANG is reported for these
examinees.
DRPNKA:
Percent of kilocalories from alcohol
DRPNKA=((DRPNALCO*7 kcal/gm alcohol)/DRPNKCAL)*100
DRPNKC:
Percentage of kilocalories from carbohydrate
DRPNKC=((DRPNCARB*4 kcal/gm carbohydrate)/DRPNKCAL)*100
The grams of total carbohydrates include sugars and complex
carbohydrates. The carbohydrate values for foods are not
derived
by direct chemical analysis. The total carbohydrate figure is
the difference between 100 and the sum of the protein, fat,
ash,
and water. This approach may overestimate the carbohydrate
content of the food and the resulting percentage of food energy
from carbohydrate.
DRPNKF:
Percentage of kilocalories from total fat
DRPNKF=((DRPNTFAT*9kcal/gm fat)/DRPNKCAL)*100
DRPNKMF:
Percentage of kilocalories from monounsaturated fat
DRPNKMF=((DRPNMFAT*9kcal/gm fat)/DRPNKCAL)*100
DRPNKP:
Percentage of kilocalories from protein
DRPNKP=((DRPNPROT*4 kcal/gm protein)/DRPNKCAL)*100
DRPNKPF:
Percentage of kilocalories from polyunsaturated fat
DRPNKPF=((DRPNPFAT*9kcal/gm fat)/DRPNKCAL)*100
DRPNKSF:
Percentage of kilocalories from saturated fat
DRPNKSF=((DRPNSFAT*9kcal/gm fat)/DRPNKCAL)*100
DRPNWATE:
Grams of water
This is the amount of water contained in foods and beverages
reported as part of the 24-hour dietary recall. Plain drinking
water and spring water usually were excluded from the dietary
recall unless beverages were diluted with plain water or water
was a component of a combination food that was reported by
components such as a homemade fruit and water drink.
DRPQ1:
Usual amount of food consumed
This question targets the total amount of food and beverages
reported, not the types of foods or the amount of a particular
food. The question targets major, not minor, changes in food
consumption that occurred on the 24-hour recall for that day of
the week.
DRPQ2A:
Quantity of plain drinking water
The quantity of plain drinking water was reported either in
total
fluid ounces per day or by specifying the number of glasses of
water and the volume per glass using standardized measurement
aids. All responses were converted to fluid ounces. If the
respondent answered "none," meaning that no plain drinking
water
is usually consumed, the amount of water was reported to be 000
fluid ounces; other quantities of plain drinking water were
recorded as xxx fluid ounces. The volume of plain drinking
water
is in addition to water found in foods and beverages; water
from
foods and beverages is included in the file variable named
DRPNWATE.
DRPQ3:
Salt added to food at the table
Ordinary salt includes sea salt, flavored salts such as garlic,
onion, and celery salt, and seasoning salts. Lite salt is
labeled as such and has a reduced sodium content. Salt
substitutes do not contain sodium.
DRPQ5-DRPQ11:
Food sufficiency questions
Similar questions about food sufficiency also were asked of a
family respondent in the Family Questionnaire found in the
Household Adult Data File (see HFF4-8). The food sufficiency
questions from the dietary recall (DRPQ5 - DRPQ11) should be
analyzed independently from the food sufficiency questions in
the
Family Questionnaire (HFF4-8). The appropriate sample weight
should be chosen based on the specific analysis.
DRPRDAY:
Recall day
DRPRDAY corresponds to the day of the week for the 24-hour
period
(midnight to midnight) in which the examinee consumed the foods
and beverages listed in the 24-hour recall. This is the day
before their MEC examination. Note: There are six examinees
who do not have 24-hour dietary recall data but do have
information pertaining to drinking water, salt use, and food
sufficiency; DRPRDAY is reported for these examinees.
DRPRESP:
Respondent for the 24-hour dietary recall interview
If the examinee was under 12 years of age, the first choice for
a
respondent was the person who was primarily responsible for
preparing meals for the child. In the case of children six to
eleven years old, the child and a proxy often participated in
the
interview. Interviews completed with the examinee and a proxy
respondent were coded as "Examinee and proxy."
1
Examinee: The examinee completed the interview without
assistance from persons other than translators if the
interview was conducted in a language other than English
or
Spanish.
2
Proxy: Someone else answered on behalf of the examinee.
This includes parents, guardians, siblings over 11 years
old, care providers, and persons responsible for planning
or
preparing foods eaten by the examinee.
3
Examinee and Proxy: The examinee and one or more proxies
contributed information for the dietary interview.
Note:
There are six examinees who do not have 24-hour
dietary recall data but do have information pertaining to
drinking water, salt use, and food sufficiency; DRPRESP is
reported for these examinees.
DRPSTAT:
1
Status of interview
Reliable and complete: The information provided by the
respondent was deemed to be reliable and complete. The
count of Phase 1 examinees with DRPSTAT=1 in this file is
seventeen fewer than the interim file NCHS released for
Phase 1 in September, 1995 (U.S. DHHS, 1995). The interim
file included seventeen examinees whose replicate dietary
interview was substituted for a missing initial interview.
Replicate recalls were excluded from this final file
because
the replicate recall data did not reflect dietary intakes
for the 24-hour time period prior to the MEC examination
when other data were obtained. Excluding the seventeen
replicate recalls does not affect the overall Phase 1
findings published earlier. Also, two examinees with
DRPSTAT=1 consumed no foods or beverages on the recall day
and have values of zero for all food and nutrient intake
variables; percentages of total energy intake from food
energy sources are not reported for these examinees and
are
8-filled.
2
Reliable but incomplete: The information provided by the
respondent was reliable but incomplete. Approximately
one-third of the recalls that were coded DRPSTAT=2 were
coded incomplete because information for a significant
portion of the recall day was not available; two-thirds of
the incomplete recalls were coded incomplete because
information (other than food amount information) for one
or
more meals, foods or beverages was not obtained.
The
total
energy and nutrient intakes for examinees with incomplete
recalls were coded "Blank but applicable." The Individual
Foods File includes information for the partial dietary
recall interview.
3
Unreliable:
The information provided by the respondent
was
deemed to be unreliable.
Total energy and nutrient
intakes
are coded "Blank but applicable."
4
Interview lost due to computer malfunction or data file
transfer problem: The dietary interview was completed,
but
the file was lost subsequently due to a computer
malfunction
or file transfer problem.
coded
"Blank but applicable."
Total nutrient intakes are
5
Breast-feeding infant or child: The foods reported during
the dietary recall interview included human milk and the
volume of milk consumed was not quantified. The number of
minutes per feeding session was recorded, but it was not
possible to calculate total nutrient intakes for infants
and
children who were breast-fed.
coded "Blank but applicable."
Total nutrient intakes are
The foods consumed by
nursing
infants and children are reported in the
individual foods file.
8
Blank but applicable: The examinee should have a dietary
recall interview but either was not interviewed or refused
the dietary interview component. Some examinees do not
have
24-hour dietary recall data because the proxy did not know
what the examinee ate the day before. In some instances,
the proxy was able to answer the post-recall questions
pertaining to drinking water consumption, salt use, and
food
sufficiency.
Blank
NCPNKA:
Home examinees were not eligible for the Dietary
Interview component.
Percent of kilocalories from alcohol
NCPNKA=((NCPNALCO*7 kcal/gm alcohol)/NCPNKCAL)*100
NCPNKC:
Percentage of kilocalories from carbohydrate
NCPNKC=((NCPNCARB*4 kcal/gm carbohydrate)/NCPNKCAL)*100
The grams of total carbohydrates include sugars and complex
carbohydrates. The carbohydrate values for foods are not
derived
by direct chemical analysis. The total carbohydrate figure is
the difference between 100 and the sum of the protein, fat,
ash,
and water. This approach may overestimate the carbohydrate
content of the food and the resulting percentage of food energy
from carbohydrate.
NCPNKF:
Percentage of kilocalories from total fat
NCPNKF=((NCPNTFAT*9kcal/gm fat)/NCPNKCAL)*100
NCPNKMF:
Percentage of kilocalories from monounsaturated fat
NCPNKMF=((NCPNMFAT*9kcal/gm fat)/NCPNKCAL)*100
NCPNKP:
Percentage of kilocalories from protein
NCPNKP=((NCPNPROT*4 kcal/gm protein)/NCPNKCAL)*100
NCPNKPF:
Percentage of kilocalories from polyunsaturated fat
NCPNKPF=((NCPNPFAT*9kcal/gm fat)/NCPNKCAL)*100
NCPNKSF:
Percentage of kilocalories from saturated fat
NCPNKSF=((NCPNSFAT*9kcal/gm fat)/NCPNKCAL)*100
NCPNS040-NCPNS220: Saturated fatty acids (SFA)
Saturated fatty acids are reported for fatty acids with carbon chain
lengths ranging from 4 to 22 carbon atoms.
NCPNM141-NCPNM221: Monounsaturated fatty acids (MFA)
Monounsaturated fatty acids are reported for fatty acids a single
double
bond and carbon chain lengths ranging from 14 to 22 carbon atoms.
NCPNP182-NCPNP226: Polyunsaturated fatty acids (PFA)
Polyunsaturated fatty acids having carbon chain lengths ranging from
18
to 22 carbon atoms in length; the number of double bonds in the PFA
acids reported ranges from 2 to 6.
References
IM Buzzard, D Feskanich. Maintaining a food composition data base
for
multiple research studies: The NCC Food Table: Rand WM (ed.). Food
Composition Data: A User's Perspective. The United Nations
University.
1987:115-122.
University of Minnesota, Nutrition Coordinating Center.
Nutrient database versions 15-27. Minneapolis, MN. 1996.
U.S. Department of Agriculture, Agricultural Research Service.
Survey
nutrient data bases for NHANES III, Phase 1 (1993) and Phase 2
(1995).
Riverdale, MD.
U.S. Department of Health and Human Services (DHHS). National
Center
for Health Statistics. Third National Health and Nutrition
Examination Survey, 1988-94, Reference manuals and reports (CD-ROM).
Hyattsville, MD: Centers for Disease Control and Prevention, 1996b.
Available from the National Technical Information Service (NTIS),
Springfield, VA. Acrobat .PDF format; includes access software:
Adobe Systems Inc. Acrobat Reader 2.1.